Abstract
In this review, recent advances in two-photon absorbing photochromic molecules, as potential materials for 3D optical memory, are presented. The investigations introduced in this review indicate that 3D data storage processing at the molecular level is possible. As 3D memory using two-photon absorption allows advantages over existing systems, the use of two-photon absorbing photochromic molecules is preferable. Although there are some photochromic molecules with good properties for memory, in most cases, the two-photon absorption efficiency is not high. Photochromic molecules with high two-photon absorption efficiency are desired. Recently, molecules having much larger two-photon absorption cross sections over 10,000 GM (GM= 10−50 cm4 s molecule−1 photon−1) have been discovered and are expected to open the way to realize two-photon absorption 3D data storage.
Highlights
Optical digital data storage, for example CD or DVD, is extensively used in the recordings of music, movies, and others
Due to quadratic dependence of 2PA on the incident light intensity, the maximum absorption occurs at the focal point of laser, allowing high spatial selectivity. These features can find a variety of optical applications, such as photodynamic therapy (PDT) [3,4], 3D optical data storage [1,2], and optical limiting [5]. 2PA was first predicted by Maria Göppert-Mayer in 1931 [6] and was demonstrated experimentally by Kaiser and Garrett, using a Ruby laser [7]
We reported porphyrin tetramers, composing of two butadiyne-linked porphyrin dimers, which were self-assembled by zinc to imidazolyl axial coordination, with a large value of
Summary
For example CD or DVD, is extensively used in the recordings of music, movies, and others. The amount of information data is notably increasing and in the future, and, thereby, further enlargement of the capacity is necessary According to this request, optical memory using two-photon absorption. Due to quadratic dependence of 2PA on the incident light intensity, the maximum absorption occurs at the focal point of laser, allowing high spatial selectivity. These features can find a variety of optical applications, such as photodynamic therapy (PDT) [3,4], 3D optical data storage [1,2], and optical limiting [5].
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